ok i found out: (brain wave gen) Stimulating the brain with binaural beat frequencies: The easiest way of applying stimulus to the brain is via ears. Other senses could be used as well, and vision is actually used quite often (often in addition to hearing). However, humans cannot hear sounds low eno...

hi
i got a simple question:
how could it be possible to listen to sounds on a for example 3,5 Hz level
if (even the recommended) earphones are only able to work from 20 Hz to 20k HZ (or something) ??

fish